fix: Make system_tray actually use installed icons on Linux Flatpak

[Fei1Yang]

Note: this pull request is depended on Losses/system_tray#1

The system_tray package currently will rewrite iconPath to it's absolute path, this pull request series allow installed icons to able to be used.

Summary by Sourcery

Update the system tray icon handling to use installed icons when available on Linux Flatpak.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request updates the system tray icon handling to use installed icons when available on Linux Flatpak.

Sequence diagram for system tray icon initialization and update

sequenceDiagram
    participant App
    participant TrayManager
    participant TrayIcon
    participant SystemTray
    App->>TrayManager: getTrayIcon()
    TrayManager->>TrayIcon: create(path, isInstalled)
    TrayIcon-->>TrayManager: icon
    TrayManager-->>App: icon
    App->>SystemTray: initSystemTray(icon.path, isInstalled: icon.isInstalled)
    Note over SystemTray: Initialize with proper icon settings
    App->>TrayManager: updateTrayIcon()
    TrayManager->>TrayManager: getTrayIcon()
    TrayManager->>SystemTray: setImage(icon.path, isInstalled: icon.isInstalled)

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File-Level Changes

Change	Details	Files
Introduce a new TrayIcon class to encapsulate icon path and installation status.	Created the TrayIcon class with path and isInstalled fields. Modified getTrayIconPath to getTrayIcon, returning a TrayIcon object. Updated usages of getTrayIconPath to use getTrayIcon and access the path and isInstalled properties of the returned TrayIcon object.	lib/utils/tray_manager.dart
Update system tray initialization to use installed icons.	Added isInstalled parameter to systemTray.initSystemTray and systemTray.setImage. Pass the isInstalled property of the TrayIcon object to systemTray.initSystemTray and systemTray.setImage.	lib/main.dart lib/utils/tray_manager.dart
Update system_tray dependency to use the latest version.	Updated the system_tray dependency in pubspec.yaml to point to a specific commit that includes the necessary changes for using installed icons. Updated pubspec.lock to reflect the changes in pubspec.yaml.	pubspec.yaml pubspec.lock

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[sourcery-ai]

Hey @Fei1Yang - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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